Export to iCalendar ical format
Thunderbird's calendar program (and others) support the newer iCalendar file format. By adding support for this export format it should provide the ability for users to view their tasks in a calendar format without making huge changes to the task coach program. (by using calendar tools to do the UI for that mode.) Ref: http://en.wikipedia.org/wiki/List_of_applications_with_iCalendar_support
Task Coach is able to export tasks and efforts to the iCalendar format. Tasks are exported as VTODO and efforts to VEVENT objects.
Oliver Pientka commented
I sync my TC with a (free online) Sync-ML Server, which also syncs with my thunderbird.
This may be usefull to you as a workarround until iCal export would be possible.
Have a look at memotoo.com
by the way, I opened a new request for the Ical to be compatible to Outlook by changing VTODO to VEVENT for tasks that I will mark as appointments
hasnt this been implemented in the latest version? I flagged it up so it is checked by the developers and changed to accomplished
Option useful for Evolution Mail too.